<head>
  <style>
    body {
      font-family: system-ui, sans-serif;
      background: #050505;
      color: #f4f4f5;
      margin: 0;
      display: grid;
      place-items: center;
      min-height: 100vh;
    }
  </style>
</head>

<body>
  <p>Hello, HTML!</p>
</body>

</html>